Using 30 percent hydrogen peroxide as the oxidant,the oxidation reaction of cyclohexanone to adipic acid catalyzed by Na2WO4·2H2O in the presence of acid ligands was investigated.The reaction follows the coordina...Using 30 percent hydrogen peroxide as the oxidant,the oxidation reaction of cyclohexanone to adipic acid catalyzed by Na2WO4·2H2O in the presence of acid ligands was investigated.The reaction follows the coordination catalysis mechanism.Both the acidity and the structure of the acid ligand had a notable effect on the catalytic ability of the catalytic system.By using sulfosalicylic acid as acidic ligand and the mole ratio of sulfosalicylic acid to Na2WSO4·2H2O was 1/1,the intermediate products of the catalytic oxidation reaction were analyzed by the GC-FTIR technique.the result showed that ε-caprolactone was the important stable intermediate product of the reaction.The possible mechanism was proposed.The cyclohexanone was oxidized by hydrogen peroxide to ε-caprolactone in the first step based on the Baeyer-Villiger oxidation mechanism,then the product from the rapid hydrolization of ε-caprolactone is oxidized to adipic acid.展开更多
将甲苯浸泡获得的艾蒿提取物置于硅土层析柱上,再用乙酸乙酯淋洗获得一个柱层析馏分。用气相色谱对该馏分进行分离,用质谱法和红外光谱法对分离组分进行了结构鉴定。共鉴定出20个组分,其中倍半萜3个,单萜6个,在这9个萜类组分中,有3个是...将甲苯浸泡获得的艾蒿提取物置于硅土层析柱上,再用乙酸乙酯淋洗获得一个柱层析馏分。用气相色谱对该馏分进行分离,用质谱法和红外光谱法对分离组分进行了结构鉴定。共鉴定出20个组分,其中倍半萜3个,单萜6个,在这9个萜类组分中,有3个是首次报道。同样,用液相色谱 质谱联用仪(LC DAD MSD)对该馏分进行了分析鉴定,结果显示这些组分中可能存在大量的萜类物质。展开更多
文摘Using 30 percent hydrogen peroxide as the oxidant,the oxidation reaction of cyclohexanone to adipic acid catalyzed by Na2WO4·2H2O in the presence of acid ligands was investigated.The reaction follows the coordination catalysis mechanism.Both the acidity and the structure of the acid ligand had a notable effect on the catalytic ability of the catalytic system.By using sulfosalicylic acid as acidic ligand and the mole ratio of sulfosalicylic acid to Na2WSO4·2H2O was 1/1,the intermediate products of the catalytic oxidation reaction were analyzed by the GC-FTIR technique.the result showed that ε-caprolactone was the important stable intermediate product of the reaction.The possible mechanism was proposed.The cyclohexanone was oxidized by hydrogen peroxide to ε-caprolactone in the first step based on the Baeyer-Villiger oxidation mechanism,then the product from the rapid hydrolization of ε-caprolactone is oxidized to adipic acid.
文摘将甲苯浸泡获得的艾蒿提取物置于硅土层析柱上,再用乙酸乙酯淋洗获得一个柱层析馏分。用气相色谱对该馏分进行分离,用质谱法和红外光谱法对分离组分进行了结构鉴定。共鉴定出20个组分,其中倍半萜3个,单萜6个,在这9个萜类组分中,有3个是首次报道。同样,用液相色谱 质谱联用仪(LC DAD MSD)对该馏分进行了分析鉴定,结果显示这些组分中可能存在大量的萜类物质。
